85807885288661 has 2 divisors, whose sum is σ = 85807885288662. Its totient is φ = 85807885288660.

The previous prime is 85807885288637. The next prime is 85807885288703. The reversal of 85807885288661 is 16688258870858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54476651488900 + 31331233799761 = 7380830^2 + 5597431^2 .

It is a cyclic number.

It is not a de Polignac number, because 85807885288661 - 2⁶ = 85807885288597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85807885288061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42903942644330 + 42903942644331.

It is an arithmetic number, because the mean of its divisors is an integer number (42903942644331).

Almost surely, 2^{85807885288661} is an apocalyptic number.

It is an amenable number.

85807885288661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85807885288661 is an equidigital number, since it uses as much as digits as its factorization.

85807885288661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3303014400, while the sum is 80.

The spelling of 85807885288661 in words is "eighty-five trillion, eight hundred seven billion, eight hundred eighty-five million, two hundred eighty-eight thousand, six hundred sixty-one".